Not sure if there are problems with my Stentura 400 or if it is user error?

I am a new court reporting student that has been practicing on a manual machine for the past 4 months. I just received an electric machine and leave a tail on a lot of my strokes.  I adjusted every setting I possible could, figuring I was probably just hitting my keys too hard but my final T and D when I press them by themselves will not advance but they show up in my next stroke.  Also, my number bar doesn't advance at all (which isn't that big of a deal because I write out my numbers, but it's still annoying).  Does the machine just need to be lubed or should I send it to get serviced?

If you haven't had your 400 serviced, do it asap.  Go online to the Steno Doctor (city of Orange, southern California) and the web site will give you a price listing for services.